Manufacture of pulp and paper.



N0. 865,168. .PATENTED SEPT. 8, 1907.

JwNL DUI-IAN. MANUFACTURE OF PULP AND PAPER.

APPLIOA'RLON FILED FEB. s. 1907. v

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No. 865,168, PATENTED SEPT. 3, 1907.

J. M. DOHAN.

MANUFACTURE OF PULP AND PAPER.

APPLIGATION'IILED FEB.9. 1907. V I

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-' PATENTED SEPT. 3, 1907. J. M. DOHAN. MANUFACTURE OF PULP AND PAPER.

APPLICATION FILED FEES. 1907.

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U ITE s A Es PATENT oFFio MANUFACTURE OF PULP .AND PAPER.

To all whom it may concern:

Be it known that-l, JsEPHM.-DOHAN, a citizen of -the United States, residingat Darling-ton, in the county ;of Delaware and State of'Pennsylvania, have invented certain Improvements in the Manufacture of Pulp and Paper, of which theiollowing is a specification.

' .My invention is more particularly a'reclaimingsysi, tem whereby'water and solid matter dischargedthereu with in the treatment of the pulp and the formation of the paper arereturned and reincorporated in the procof manufacture in a continuous cyclic operation;

In the usual operations, large volumes of water are employed and wasted, at considerable expense and inconvenience and fromii'ain orother causes the supply is liablev to contain'objectionable matter necessi tating filtration or otherwise affecting the. product in'-' juriously'. Operations have been proposed for separating pulp ,fi-om white water and returning it for in in thepaperration, very little raw water'is required, and there is "practically no deleterious matter from the water-f The.

bulk of the solid matter discharged with'the water-in the treatment of the pulp and the formation of the paper is precipitated, and carried back suspended in the water for direct incorporation in the paper web, while any valuable matter not so separated. is carried by the remaining clarified water to 'the pulp in the heaters or other stage of the operation.- Fiber, :chemicals and clay, valuable for use in the product'and usually 10st, 7 are recovered, and incorporated in the product. 7

The-foregoing characteristic features together with further advhntagesof the systemwill more fully appear by rcierence to the following description and-the accompanying drawings of the invention.

' In the'drawings, Figure 1 is a diagrammatic plan view in illustration-of my invention, details of the apparatus being omitted; Fig. 2 is a'plan view. of the concentrating, segregating and storing tanks with parts omitted to more clearly show the-interior construction;

Fig. 3 is a vertical sectional view taken-on the line 3-3 of Fig. 2, with parts broken away to'show interior de mils; Fig. .4 is a sectional side elevation showing the interior details of the primarytank and a paper making machine connected I therewith;.1 ig.- 5 is a plan View showing bafl'ling means of the primary tank; and Fig. is a vertical sectional..view onthefline 6 6 of Fig. 2

. Specification of Letters Patent. Application 515a February 19, 1907. Serial No. 356,517.

walls 19, the inner walls 20 and21, the bottoms 22 and 23, and the riflie boards 24'; the-bottoms beinginclined Patented Sept. 3, 199 7.

" The system, as illustrated, is-applie'd to usual forms of pulp and paper machinery comprising the heaters;

1,'the stuff chest 2 with which the heaters communicate by the conduit 3, the refining engine 4 connected with the stuff chest by'th'e duct 5, and the Fourfdrinier conduit 7 and with the stufi chestby the cbnduit 8 circuit with this apparatus, are the concentrating,

so. 'machi'n'e G connecte'dwith' the refining engine by the I segregating and storing means, comprisingiithe co 11 nected compartments or' tank's. 9, 10 and'il.

The white water or liquid with-the solidandj'other valuable matter, discharged m-th'e traveling. wire apron 12 in forming thepap'er web'and'collectedby the sluice 13, is carried throughf-thefpipe14,. under; cohtrol of the two way valve l5,=' to-the tanlg9,- the branch pipe 14" providing meansforgotherwise dis charging. liquid vfrom the sluice whenit is not desired in the tank as in cleaning." -'--This mi -has the top thereof the chambers 16, 17 and 18 iorrnedjby the outer downward from the inner to the: outer walls and flie lower portions so as to form with-the'bottoius and 'outer walls acute trihedral angles, projectingin the direcriflie boards being-inclined foi'ward at their, outer and I tion of flow. from the chamber 16 through the chambers 17, and thence to the chamber 18." Holes.25" and. 26

are formed in the lowercorners of the rifile boards Add the outer portionsof the bottoms forthe'e of wa-. ter and-valuabha contents. 4 The pipe 14 carries the water with itsburden of valuable contents from the sluice 13' into the-chamber 16, whence there is flow over the rifile boardsfl i, 1

through the holes 25 and 26, through the successive compartments 17 :and 18, and through the vertical:

opening 27 at the termination of the channel 'like'part I of the chamber 18 formed. by the walls 20, the bottom I 18 of the channel being-slightly inclined to aid the flow. The baflling effect of the riflie boards and sli ht.

suction through the openings2 5, 26., and 27 togetherwith the comparatively high specificgravity of the solid matter with relation tothe water by which it is carried, causes more or less [of such matter to settle from water passing through the openings 26 and 27 into the well or chamber-28.. This chamber has inl clined bottom sections 29, 30, 3] and'32 pitched beyond the angle of repose of the fiber and forming abasin discharging at its lowest point through a pipe A pump 35 in-this pi governed by the con trolling valve 34, governs suctionand withdrawal of water containing concentrated solids for use in the "system, a branch pipe 33, controlled by the valve 34:, permitting cleansing of the compartment by dis- I charge of the contents into-the waste trough 36. Water, which fills the chamber '28 and is in 'a'comparatively sired to the vat' 58.

35 wire 12 and completes a circuit.

water to the beater tank 64 with a bottom inclined quiescent state by reason of its volume, flows therefrom, by a current having the direction of arrows shown, through the weir 37. The flow is baffied to further separate solids by the aprons 38, 39iand 40,.

5 the latter having the notch 41 therein through which the current passes. The weir 37 discharges the water, ,lwith the small amount of solid matter and chemicals in solution which it contains, into the trough 12, where it may be treated with alum or other clarifying l agent if required, and from this troughthe water passes by the weir 43 into the large storage compartment 10. Here the subsidence of further solid matter takes place, the. deposit being collected in the basin formed by the sectional bottoms '44, 45, 46, and 47,

l having inclinationssharper than the angle of repose.

The lowest point of this basin discharges through a pipe 48, the flow through which for purposes of utilization is controlled by the pump 50; while the tank is being cleansed the contents maybe discharged by the branch pipe 48 (controlled by the two-way valve 51) discharging to the trough 36'. \Nater in the chamber 10 flows over the vertical baflle or wall 52 into the chamber 11 with the bottom sections 53, 54 and 55, having inclinations sharper than the angle of repose,

these sections forming a basin having an outlet from its lowest 'part through the pipe 57 by which prac .to an outlet by way of the pipe 65.having branches 66 leading to the heaters 1 and val'vcs 67 for controllingthe flow theretoby which its circuit is co1nploted.- The pipe 65 is also connected with the wash water tank 68 for supplying raw water to the beaters when desired. The pipe 57; having the two-way valve 79 and the pump 59 therein, carries the clarified water from the chamber 11 to the machine water tank 69,

which distributes it by the usual system of ducts to the paper rnacbinefor the usual uses such as supplying the shower pipes and cleansing, whence it finds its way to the sluice 13, by which its circuit is completed. \Kater discharged at the ends oi the beater washing cylinders may be carried by the pipe 70 to the tank 10, excepting where such water undesirable in the system when it is discharged through the branch 70 controlled by the two way valve 71. The overflow from the tank 64 is conducted by the branch 5 70 to the pipe 70 and thence to the tank 10.

It is to be understood that not only the water discharged [tom the wire 12 to the sluice 13, but also all water collected from the paper web, as through the suction boxes by the suction pump 73, is carried into the system for recirculation by the pipe 74 connected with thepipe 14. r i

' In order that raw water may be brought into the system when desired, tocffect cleansing, orto permit of repairs, the raw water main 76 is connected by the pipe 82 and the two-way valve 49 with the pump 50, through which the raw water may bra-introduced into the system in substitution of the purified water, from which it passes through the pipe 43 to the tank 64, and thence through the pipe 65 to the beater system, after which the operation proceeds as in the usual practice, and in the manner hereinabove described. Similarly, and for similar purposes, from the raw water main 76 by the pipe 78 controlled by the two-way valve 7 9, raw water is by the pump 59 introduced into the machine tank 69, and thence into the system by the usual practice not shown on the drawings. At such tunes the flow through the drain 13 by means of the two-way valve 15 is diverted to waste by the discharge pipe 14. i

For cleansing purposes, the pipe 83 leads from the raw water main 7G to the several compartments which it supplies by means of branches containing the controlling valves 83, 83 and 83. Fortlie purpose of restoring the deficiency occasioned by leakage and the evaporation of the water from the moist paper web, the controlling valve .83 is allowed to remain open sufficiently to restore the small amount of water lost in operation.

In my system I do not reclaim the Water used in washing rags as this is polluted. The separate raw water supply for this purpose isindicated in my drawing. From the main 76 the raw wateris conducted by the pipe 77 to the pump 77 by which 'it is discharged through the pipe 77 into awasher tank 68, from which it may be distributed to Washing engines by appropriate means, not shown on my drawings, as in the usual practice.

Cocks 84, 84, and S4 permit the contents of the compartments 9, 10 and 11 to be tested to determine the efficiency of the operations and the condition of the contents of the compartment, in order that the suction of the pump 35 may be regulated accordingly.

The comparatively small amount of raw water that is required for addition to the system may be filtered with little expense if required but this would not be necessary generally as by dilution a considerable amount of impurity in the admitted water would be insignificant when mixed with the whole, and would be cleansed quickly by use.

The extent of the saving of water and the advantage of-avoiding the use of impure water is indicated by the fact that the beating and paper-making ordinarily require from each paper machine unit from three hundred thousand to five hundred thousand gallons of water per day of twenty-four hours, while my system need not contain more than twenty to thirty thousand gallons per machine unit, which is passed through the'paper web from fifteen to twenty-five times per day and the loss of water in operation requiring replacement is but about two pounds of water per pound of paper manufactored.

'The paper made by this mode of operation, by reason of the reincorporation of solid matter and the use of practically pure water, has a finer texture and finish and greater freedom from specks than obtain in products resulting from the usual methods of operation.

Having described my invention, I claim Correction in Letters. Patent No. I 865,168.

water containing it from the water fronrwhich it is conwhlch consists in collecting substantially all-the water and centrated, and returning and reincorporating at c'lifierent stages in the process of manufacture the concentrated solid matter with the water containing it and the water: from which said solid matter is concentrated. 2. In the manufacture of pulp and paper, the method which consists in collecting the bulk of water and solid matter discharged from fibrous material in process OfvtOl'I-D' ing a Web, circulating and ballling said water with precipitation of solid matter, flowing OK the Water from which said solid matter is precipitated and returning it for reincorporation in the treatment of the fibrous material in process of manufacture, and flowing off the precipitated s' lid matter with the water containing it for separate reincorporatlon in the process of treating said fibrous matel'inl.

3. In the manufacture of pulp and paper, the method in the Patent Oflice.

[SEAL] Signed and seziled this 29th day of October, A} 1)., 19 07.

JOSEPH M. DOHAN.

- Witnesses:

IATHERX1IE E. Momma, EDVAIID B. RsEnnR, .lonN F. NOLAN.

It is hereby certified that in Letters Patent No. 865,168, granted September 3, 1907, v upon the application of Joseph Dohan, of Darlington, Pennsylvania, for an improvement in the Manufacture of Pu lp and Paper, an error appears requiring the following correction: The drawings forming a. part of said patent should have heen corrected, as directed by the patentee in anamendtnent duly filed before the issue of patent, as follows: On Figure 1 the refining en gine indicated by reference numeral 4 should appear in the reverse position; and that the said Letters'Patent should be read with this correction therein that the same may conform to the record of the case E. B. MOORE,

Commissioner of Patents.

Correction in Letters. Patent No. I 865,168.

water containing it from the water fronrwhich it is conwhlch consists in collecting substantially all-the water and centrated, and returning and reincorporating at c'lifierent stages in the process of manufacture the concentrated solid matter with the water containing it and the water: from which said solid matter is concentrated. 2. In the manufacture of pulp and paper, the method which consists in collecting the bulk of water and solid matter discharged from fibrous material in process OfvtOl'I-D' ing a Web, circulating and ballling said water with precipitation of solid matter, flowing OK the Water from which said solid matter is precipitated and returning it for reincorporation in the treatment of the fibrous material in process of manufacture, and flowing off the precipitated s' lid matter with the water containing it for separate reincorporatlon in the process of treating said fibrous matel'inl.

3. In the manufacture of pulp and paper, the method in the Patent Oflice.

[SEAL] Signed and seziled this 29th day of October, A} 1)., 19 07.

JOSEPH M. DOHAN.

- Witnesses:

IATHERX1IE E. Momma, EDVAIID B. RsEnnR, .lonN F. NOLAN.

It is hereby certified that in Letters Patent No. 865,168, granted September 3, 1907, v upon the application of Joseph Dohan, of Darlington, Pennsylvania, for an improvement in the Manufacture of Pu lp and Paper, an error appears requiring the following correction: The drawings forming a. part of said patent should have heen corrected, as directed by the patentee in anamendtnent duly filed before the issue of patent, as follows: On Figure 1 the refining en gine indicated by reference numeral 4 should appear in the reverse position; and that the said Letters'Patent should be read with this correction therein that the same may conform to the record of the case E. B. MOORE,

Commissioner of Patents.

in Lettersv Patent No. 865,168.

Correction It is hereby certified that in Letters Patent No. 865,168, granted September 3, 1907, upon the application of Joseph M. Dohan, of Darlington, Pennsylvania, for an improvement in the Manufacture of Pulp and Paper, an error appears requiring the following correction: The drawings forming a part of said patent should have been corrected, as directed by the patentee in an amendment duly filed before the issue of patent, as follows: On Figure 1 the refinihg engine indicated should appear in the reverse position; and that the said Letters Patent should be read with this correction therein thatthe same may conform to the record of the case in the Patent Ofiice.

Signed and sealed this 29th day of October, A. D., 1907.

[SEAL] E. B. MOORE,

Commissioner of Patents. 

